Halford Verroctone - Use Embarcation to get on land and kill 15 mobs. You can use Lance-fusée will be on your extra bar, that spell is marking place where cannons from ship need to hit ( they taking 100% hp on hit ).

Halford Verroctone - You need to back to Wind's Redemption in Boralus. Same way like you get to Shatterstone Harbor. Go to speak he is on ship ask him to take you back. after finish this quest you will reach Vol'dun Foothold in Prêt à la guerre